Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Statement Of Income And Comprehensive Income [Abstract]
Net (loss) income	$ (274)	$ 148
Other comprehensive income:
Net changes related to available-for-sale securities, net of tax		(5)
Foreign currency translation adjustments	1,832	1,041
Other comprehensive income	1,832	1,036
Comprehensive income	$ 1,558	$ 1,184